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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
sessions2trash.py

Run this script in a web2py environment shell e.g. python web2py.py -S app
If models are loaded (-M option) auth.settings.expiration is assumed
for sessions without an expiration. If models are not loaded, sessions older
than 60 minutes are removed. Use the --expiration option to override these
values.

Typical usage:

    # Delete expired sessions every 5 minutes
    nohup python web2py.py -S app -M -R scripts/sessions2trash.py &

    # Delete sessions older than 60 minutes regardless of expiration,
    # with verbose output, then exit.
    python web2py.py -S app -M -R scripts/sessions2trash.py -A -o -x 3600 -f -v

    # Delete all sessions regardless of expiry and exit.
    python web2py.py -S app -M -R scripts/sessions2trash.py -A -o -x 0
"""

from gluon.storage import Storage
from optparse import OptionParser
import cPickle
import datetime
import os
import stat
import time

EXPIRATION_MINUTES = 60
SLEEP_MINUTES = 5
VERSION = 0.3


class SessionSet(object):
    """Class representing a set of sessions"""

    def __init__(self, expiration, force, verbose):
        self.expiration = expiration
        self.force = force
        self.verbose = verbose

    def get(self):
        """Get session files/records."""
        raise NotImplementedError

    def trash(self):
        """Trash expired sessions."""
        now = datetime.datetime.now()
        for item in self.get():
            status = 'OK'
            last_visit = item.last_visit_default()

            try:
                session = item.get()
                if session.auth:
                    if session.auth.expiration and not self.force:
                        self.expiration = session.auth.expiration
                    if session.auth.last_visit:
                        last_visit = session.auth.last_visit
            except:
                pass

            age = 0
            if last_visit:
                age = total_seconds(now - last_visit)

            if age > self.expiration or not self.expiration:
                item.delete()
                status = 'trashed'

            if self.verbose > 1:
                print 'key: %s' % str(item)
                print 'expiration: %s seconds' % self.expiration
                print 'last visit: %s' % str(last_visit)
                print 'age: %s seconds' % age
                print 'status: %s' % status
                print ''
            elif self.verbose > 0:
                print('%s %s' % (str(item), status))


class SessionSetDb(SessionSet):
    """Class representing a set of sessions stored in database"""

    def __init__(self, expiration, force, verbose):
        SessionSet.__init__(self, expiration, force, verbose)

    def get(self):
        """Return list of SessionDb instances for existing sessions."""
        sessions = []
        tablename = 'web2py_session'
        if request.application:
            tablename = 'web2py_session_' + request.application
        if tablename in db:
            for row in db(db[tablename].id > 0).select():
                sessions.append(SessionDb(row))
        return sessions


class SessionSetFiles(SessionSet):
    """Class representing a set of sessions stored in flat files"""

    def __init__(self, expiration, force, verbose):
        SessionSet.__init__(self, expiration, force, verbose)

    def get(self):
        """Return list of SessionFile instances for existing sessions."""
        path = os.path.join(request.folder, 'sessions')
        return [SessionFile(os.path.join(path, x)) for x in os.listdir(path)]


class SessionDb(object):
    """Class representing a single session stored in database"""

    def __init__(self, row):
        self.row = row

    def delete(self):
        self.row.delete_record()
        db.commit()

    def get(self):
        session = Storage()
        session.update(cPickle.loads(self.row.session_data))
        return session

    def last_visit_default(self):
        return self.row.modified_datetime

    def __str__(self):
        return self.row.unique_key


class SessionFile(object):
    """Class representing a single session stored as a flat file"""

    def __init__(self, filename):
        self.filename = filename

    def delete(self):
        os.unlink(self.filename)

    def get(self):
        session = Storage()
        with open(self.filename, 'rb+') as f:
            session.update(cPickle.load(f))
        return session

    def last_visit_default(self):
        return datetime.datetime.fromtimestamp(
                os.stat(self.filename)[stat.ST_MTIME])

    def __str__(self):
        return self.filename


def total_seconds(delta):
    """
    Adapted from Python 2.7's timedelta.total_seconds() method.

    Args:
        delta: datetime.timedelta instance.
    """
    return (delta.microseconds + (delta.seconds + (delta.days * 24 * 3600)) * \
            10 ** 6) / 10 ** 6


def main():
    """Main processing."""

    usage = '%prog [options]' + '\nVersion: %s' % VERSION
    parser = OptionParser(usage=usage)

    parser.add_option('-f', '--force',
        action='store_true', dest='force', default=False,
        help=('Ignore session expiration. '
            'Force expiry based on -x option or auth.settings.expiration.')
        )
    parser.add_option('-o', '--once',
        action='store_true', dest='once', default=False,
        help='Delete sessions, then exit.',
        )
    parser.add_option('-s', '--sleep',
        dest='sleep', default=SLEEP_MINUTES * 60, type="int",
        help='Number of seconds to sleep between executions. Default 300.',
        )
    parser.add_option('-v', '--verbose',
        default=0, action='count',
        help="print verbose output, a second -v increases verbosity")
    parser.add_option('-x', '--expiration',
        dest='expiration', default=None, type="int",
        help='Expiration value for sessions without expiration (in seconds)',
        )

    (options, unused_args) = parser.parse_args()

    expiration = options.expiration
    if expiration is None:
        try:
            expiration = auth.settings.expiration
        except:
            expiration = EXPIRATION_MINUTES * 60

    set_db = SessionSetDb(expiration, options.force, options.verbose)
    set_files = SessionSetFiles(expiration, options.force, options.verbose)
    while True:
        set_db.trash()
        set_files.trash()

        if options.once:
            break
        else:
            if options.verbose:
                print 'Sleeping %s seconds' % (options.sleep)
            time.sleep(options.sleep)


main()